I'm surprised a narrow IF feeding window gives the carb benefits, but sounds worth a try for sustainability long term.
Counter-example: I was on Keto for 2 years and my blood levels became prediabetic (105 and 100 in 2 blood tests over the course of 2 annual doctor visits).
As soon as I reintroduced carbs to normal levels (I bought a glucosometer) my blood sugars went back down to optimal (85). My most recent blood work was at 90.
Your mileage may vary and everyone's GI responds differently to different foods.
After cutting all that out my energy levels were much more even. It was like night & day. I also dropped several pounds over the course of the first month. I'll occasionally treat myself to bread/carbs but nowhere near to the degree I used to.